diff --git a/AndroidBackEventDemo/README.md b/AndroidBackEventDemo/README.md
index 09b0019..9d6ac6d 100644
--- a/AndroidBackEventDemo/README.md
+++ b/AndroidBackEventDemo/README.md
@@ -1,2 +1,101 @@
-# hello-world
-Hello world new project template.
+# Cocos Creator 教程 : 监听 Android 返回键
+>有时做原生游戏时，特别是Android平台需要监听返回键，在游戏中做出回应如返回游戏上一层或者是退出游戏。
+
+![exit_game.jpg](https://upload-images.jianshu.io/upload_images/2315803-0dca28bfd14407b6.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
+
+### 实现
+* 监听事件
+~~~
+//android 返回键
+cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
+~~~
+* 取消事件
+~~~
+cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
+~~~
+* 回调处理
+~~~
+
+onKeyDown(event) {
+        switch (event.keyCode) {
+            //注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
+            case cc.KEY.back:
+                if (this.isBackGame) {
+                    cc.director.end();
+                    return;
+                }
+                this.isBackGame = true;
+                this.label.string = '再次按返回键\n将退出游戏';
+                this.node.runAction(cc.sequence(cc.delayTime(3), cc.callFunc(() => {
+                    this.isBackGame = false;
+                    this.label.string = '';
+                })));
+                break;
+        }
+    },
+~~~
+
+### 完整代码
+~~~
+cc.Class({
+    extends: cc.Component,
+
+    properties: {
+        label: {
+            default: null,
+            type: cc.Label
+        },
+        text: 'Hello, World!'
+    },
+
+    // use this for initialization
+    onLoad: function () {
+        this.label.string = this.text;
+        this.registerEvent();
+    },
+
+    registerEvent() {
+        //android 返回键
+        cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
+    },
+
+    onKeyDown(event) {
+        switch (event.keyCode) {
+            //注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
+            case cc.KEY.back:
+                if (this.isBackGame) {
+                    cc.director.end();
+                    return;
+                }
+                this.isBackGame = true;
+                this.label.string = '再次按返回键\n将退出游戏';
+                this.node.runAction(cc.sequence(cc.delayTime(3), cc.callFunc(() => {
+                    this.isBackGame = false;
+                    this.label.string = '';
+                })));
+                break;
+        }
+    },
+
+    offEvent() {
+        cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeyDown, this);
+    },
+
+    // called every frame
+    update: function (dt) {
+
+    },
+
+    onDestroy() {
+        this.offEvent();
+    }
+});
+
+~~~
+
+### 关于cc.systemEvent
+它是系统事件，**systemEvent**目前支持按键事件和重力感应事件。详情[官方文档](https://docs.cocos.com/creator/manual/zh/scripting/player-controls.html?h=systemevent)。
+### 关于cc.KEY修改成cc.macro.KEY的问题
+详情请[点击这](https://forum.cocos.com/t/2-0-cc-macro/69113)
+###最后
+如果对你有用，请点喜欢哦。最后放出[Demo](https://github.com/Leo501/CocosCreatorTutorial/tree/master/AndroidBackEventDemo)给大家参考。
diff --git a/AndroidBackEventDemo/assets/Script/HelloWorld.js b/AndroidBackEventDemo/assets/Script/HelloWorld.js
index 0f44f00..d8eef6f 100644
--- a/AndroidBackEventDemo/assets/Script/HelloWorld.js
+++ b/AndroidBackEventDemo/assets/Script/HelloWorld.js
@@ -22,6 +22,7 @@ cc.Class({
 
     onKeyDown(event) {
         switch (event.keyCode) {
+			//注意Creator版本为2.x的请把cc.KEY.back。修改成cc.macro.KEY.back
             case cc.KEY.back:
                 if (this.isBackGame) {
                     cc.director.end();
diff --git a/PQCode/settings/builder.json b/PQCode/settings/builder.json
index c063647..6ce5fce 100644
--- a/PQCode/settings/builder.json
+++ b/PQCode/settings/builder.json
@@ -29,5 +29,10 @@
     "orientation": "landscape"
   },
   "xxteaKey": "5aaeee52-1608-4f",
-  "zipCompressJs": true
+  "zipCompressJs": true,
+  "qqplay": {
+    "orientation": "portrait",
+    "REMOTE_SERVER_ROOT": ""
+  },
+  "fb-instant-games": {}
 }
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